WDB files are used in Windows Work Database, and since they are discontinued, you need to use one of these methods to open WDB files ...

Open the Files app. In the left navigation panel, choose the drive containing the file. Find the file in its folder, then double-click to open it. Alternatively, right-click the file and select Open.

If you're tired of having to jump through hoops to open files with sudo privileges in the GNOME File Manager, Jack Wallen has just the trick you need.

To view file associations in Windows 10, open File Explorer and navigate to the folder that contains files of the file type you want to modify. Next, right-click on a file and select Properties ...